The most precise of the activation systems, it does not miss and also has the longest longevity among the various activation systems. It is a pair of uprights with relative barriers connected to the electric gate, one upright is the photocell while the second perfectly aligned is its match with a reflector. If you cut the light beam of the photocell, the gate opens allowing the user to pass through. This product needs at least 1 m? to be able to install it, there must be just the right distance to be effective. The photocell post must be at least 1 m from the electric gate to make a good job, this system is recommended for those who want a long-lasting gate.